My 1970 house was wired with aluminum branch circuits which I pig-tailed 35 years ago. I want to test the circuits by pulling 13 A from each receptacle and observing the voltage drop. There are six 15-A circuits 12 AWG AL and four 20-A 10 AWG AL. I have added two more 20-A circuits 12 AWG CU.
How should I proceed? Should I first take the cover off the panel and test the voltage drop on the incoming legs or should I proceed to test the receptacles?
The electrical panel is a GE with four 2-pole 240 V breakers in the top (30 A, 40 A, 50 A, and 60 A, for clothes dryer, a/c, kitchen range, and branch feeder) and a lower section with slots for two columns of eight 1/2-inch breakers fed by a 60-A 'main' breaker. The panel is in the attached garage.
The panel is now full because I have two GFCI breakers (1 inch each) and I have one 2-pole 50 A breaker for the whole house surge protector (Eaton). The house has no AFCI breakers. If I want this, I would have to use AFCI receptacles.
Preliminary results with a 13-A current draw (1600 W hair dryer):
Garage: one 15-A circuit goes from 124 V to 120 V, and one 20-A CU circuit also goes from 124 to 120. Another 15-A receptacle goes from 121 V to 113 V.
Farthest bedroom from garage: 15-A receptacle 122.7 V to 112.4 V.